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38 lines
1.1 KiB
Go
38 lines
1.1 KiB
Go
package mathextra_test
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import (
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"fmt"
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"math/big"
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"testing"
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"github.com/wader/fq/internal/mathextra"
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)
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func TestBigIntSetBytesSigned(t *testing.T) {
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testCases := []struct {
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buf []byte
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s string
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}{
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{[]byte{1}, "1"},
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{[]byte{0b1111_1111}, "-1"},
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{[]byte{0b1000_0000}, "-128"},
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{[]byte{0b0111_1111}, "127"},
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{[]byte{0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, "9223372036854775807"},
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{[]byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, "-1"},
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{[]byte{0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, "-9223372036854775808"},
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{[]byte{0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, "2361183241434822606847"},
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{[]byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, "-1"},
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{[]byte{0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, "-2361183241434822606848"},
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}
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for _, tC := range testCases {
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t.Run(fmt.Sprintf("%v %s", tC.buf, tC.s), func(t *testing.T) {
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var n big.Int
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expected := tC.s
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actual := mathextra.BigIntSetBytesSigned(&n, tC.buf).String()
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if expected != actual {
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t.Errorf("expected %s, got %s", expected, actual)
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}
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})
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}
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}
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